LTC3527

LTC3527/LTC3527-1 Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters FEATURES n Dual Synchronous Step-Up DC/DC Converters n Delivers 3.3V at 200mA/100mA from one Alkaline/ NiMH Cell, or 3.3V at 400mA/200mA from Two Cells n VIN Start-Up Voltage: 700mV n 0.5V to 5V VIN Range After Start-Up n 1.6V to 5.25V VOUT Range n Output Disconnect in Shutdown n VIN > VOUT Operation n 1.2MHz or 2.2MHz Operation n Up to 94% Efficiency n 12μA Quiescent Current in Burst Mode® Operation n Inrush Current Limiting and Soft-Start n Internal Synchronous Rectifiers n Logic-Controlled Shutdown (< 2μA) n Quick VOUT Discharge (LTC3527-1) n 16-Lead, 0.75mm × 3mm × 3mm QFN Package APPLICATIONS n MP3/Personal Media Players n Noise Canceling/Bluetooth Headsets n Wireless Mice n Portable Medical Instruments DESCRIPTION The LTC®3527/LTC3527-1 are dual high efficiency, step-up DC/DC converters in a space saving 16-lead 3mm × 3mm QFN package. Battery life is maximized with a 700mV startup voltage and operation down to 500mV once started. The SHDN and PGOOD pins enable the converters to be sequenced or started together. The LTC3527/LTC3527-1 limit inrush current during startup. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solution footprint. The current mode PWM design is internally compensated reducing external parts count. Burst Mode operation or fixed frequency operation is selectable via the MODE pin. Anti-ring circuitry reduces EMI in dis...